The Height of F-Layer Irregularities in the Arctic Ionosphere
Results and interpretations of oblique incidence soundings of the arctic ionosphere are presented. Anomalous echoes are found to be prevalent in high latitudes in contrast to lower latitudes where 2F groundscatter predominates. One of the echoes seen regularly at College, Alaska has been identified...
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Geophysical Institute at the University of Alaska
1959
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ftunivalaska:oai:scholarworks.alaska.edu:11122/3560 2023-05-15T14:59:24+02:00 The Height of F-Layer Irregularities in the Arctic Ionosphere Bates, Howard F. 1959-03 http://hdl.handle.net/11122/3560 en_US eng Geophysical Institute at the University of Alaska http://hdl.handle.net/11122/3560 Geophysical Institute Report 1959 ftunivalaska 2023-02-23T21:36:02Z Results and interpretations of oblique incidence soundings of the arctic ionosphere are presented. Anomalous echoes are found to be prevalent in high latitudes in contrast to lower latitudes where 2F groundscatter predominates. One of the echoes seen regularly at College, Alaska has been identified as direct F-layer (IF) backscatter. The observations of the IF echo provide direct evidence of the presence of irregularities in the F-layer between heights of 350 and 600 km. The IF echoes are recorded regularly at night and occasionally during the day in disturbed periods. They appear to be associated with auroral ionization. Simultaneous reception of 2F echoes from the north and the south indicates that at times the reflecting layer is tilted. Tilt-angles in the vicinity of 2 to 3 degrees are found. The 2F echoes from the north usually connect to the extraordinary branch of the vertical incidence trace while the 2F echoes from the south appear to connect to the ordinary branch. The analysis of groundscattered (2F) echoes is extended from a plane to a spherical geometry, and it is shown that a geometrical extension of the plane earth theory is adequate. The observed range-frequency dependence differs only slightly from that predicted by the latter theory. The research reported in this document has been sponsored by the Electronic Research Directorate of the Air Force Cambridge Research Center, Air Research and Development Command. Air Force Research Contract No. AF 19(604)-1859 Yes Report Arctic Alaska University of Alaska: ScholarWorks@UA Arctic |
institution |
Open Polar |
collection |
University of Alaska: ScholarWorks@UA |
op_collection_id |
ftunivalaska |
language |
English |
description |
Results and interpretations of oblique incidence soundings of the arctic ionosphere are presented. Anomalous echoes are found to be prevalent in high latitudes in contrast to lower latitudes where 2F groundscatter predominates. One of the echoes seen regularly at College, Alaska has been identified as direct F-layer (IF) backscatter. The observations of the IF echo provide direct evidence of the presence of irregularities in the F-layer between heights of 350 and 600 km. The IF echoes are recorded regularly at night and occasionally during the day in disturbed periods. They appear to be associated with auroral ionization. Simultaneous reception of 2F echoes from the north and the south indicates that at times the reflecting layer is tilted. Tilt-angles in the vicinity of 2 to 3 degrees are found. The 2F echoes from the north usually connect to the extraordinary branch of the vertical incidence trace while the 2F echoes from the south appear to connect to the ordinary branch. The analysis of groundscattered (2F) echoes is extended from a plane to a spherical geometry, and it is shown that a geometrical extension of the plane earth theory is adequate. The observed range-frequency dependence differs only slightly from that predicted by the latter theory. The research reported in this document has been sponsored by the Electronic Research Directorate of the Air Force Cambridge Research Center, Air Research and Development Command. Air Force Research Contract No. AF 19(604)-1859 Yes |
format |
Report |
author |
Bates, Howard F. |
spellingShingle |
Bates, Howard F. The Height of F-Layer Irregularities in the Arctic Ionosphere |
author_facet |
Bates, Howard F. |
author_sort |
Bates, Howard F. |
title |
The Height of F-Layer Irregularities in the Arctic Ionosphere |
title_short |
The Height of F-Layer Irregularities in the Arctic Ionosphere |
title_full |
The Height of F-Layer Irregularities in the Arctic Ionosphere |
title_fullStr |
The Height of F-Layer Irregularities in the Arctic Ionosphere |
title_full_unstemmed |
The Height of F-Layer Irregularities in the Arctic Ionosphere |
title_sort |
height of f-layer irregularities in the arctic ionosphere |
publisher |
Geophysical Institute at the University of Alaska |
publishDate |
1959 |
url |
http://hdl.handle.net/11122/3560 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Alaska |
genre_facet |
Arctic Alaska |
op_source |
Geophysical Institute |
op_relation |
http://hdl.handle.net/11122/3560 |
_version_ |
1766331516052307968 |